I have had a good number of friends and hunting companions who were Army surgeons and medics in WWII, Korea, and Vietnam and later.
Everyone who has been wounded by a 7.62x39 inside of 200 yards, seen the wounds, and operated on the wounded, will tell you that it simply hits way harder than the M-16.
In an operations theather where the ranges are beyond 150 yards, the M-14 has the advantage of engaging an advancing enemy long before they can muster effective return fire, because it is a true battle rifle. The AK-47 is an assault rifle, and most M-16s are a half-breed compromise of the two, and second-rate in both roles.
You ought to be able to carry 200 rounds of M-14 ammo, which is a lot of juice if you don't waste it.
